مخارج قابل توجیه
Note that the length of the highway segment is not needed, as both the benefits and the justifiable expenditure will be stated on a per-mile basis.
The maximum justifiable expenditure for the surface is, therefore, the present worth of $36,500 per year for 25 years.
However, as Equation 3.2 does not include the cost of a replacement at time = 0, the first cost must be added to determine the total justifiable expenditure for the permanent embankment.
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